US1358103A - Shaker-screen - Google Patents

Description

M. OTTO.

SHAKER SCREEN.

APPLICATION FILED FEB-24,1919.

- Patented Nov. 9, 1920.

3 SHEETS-SHEET l.

M. OTTO.

SHAKER SCREEN.

APPLICATION FILED FEB. 24, 1919.

Patented Nov. 9, 1920.

3 SHEETS-SHEET Z.

b'fllllllil Zzvanor Jfcm. Oifo M. OTTO.

SHAKER SCREEN.

APPLlCATlON FILED FEB. 24. 1919.

1,358,103. Patented Nov. 9, 1920.

3 SHEETS-SHEET 3.

m v W UNITEDSTATES PATENT OFF ICE.

MATT OTTO, OF CAREY, OHIO, ASSIGNOR TO THE NATIONAL LIME & STONE CO., 01 CAREY, OHIO, A CORPORATION OF OHIO.

SHAKER-SCREEN.

Specification of Letters Patent.

Patented Nov. 9, 1920.

Application filed February 24, 1919. Serial No. 278,574.

To all whom it may concern Be it known that I, MATT O'r'ro, a citizen of the United States, residin at Carey, in the county of Wyandot and tate of Ohio have invented a certain new and useful Improvement in Shaker-Screens, of which the following is a specification.

My invention relates to improvements in shaker screens such as may be used for screening limestone, coal, sand or any other comminuted or fragmentary materials. It has for one object to provide a new and improved form of self-balancing screen which may be used in any kind of a building without undue vibration. Another object is to provide a light, high speed, large capacity screen which will pass material through it with a minimum of power loss and with a maximum of speed. Other objects will appear from time to time in the specification.

My invention is illustrated more or less diagrammatically in the accompanying drawings, wherein- Figure 1 is a plan view;

Fig. 2 is a side elevation;

Fig. 3 is a section along line 33 of Fig. 2;

Fig. 4c is a detailed elevation of a modi fled form;

Fig. 5 is a section along the line 5-5 of Fig. 4;

Fig. 6 is a side elevation of a modified form.

Like parts are indicated by like characters in all the figures.

A is a solid durable base frame or bed made up of a series of separate beams or girders and adapted to be put in place in any structure or on any support or foundation in the usual manner. Upon it this base frame carries pillow blocks A A in which is rotatably mounted a shaft A upon which is a pulley A adapted to be driven from any suitable source of power. At either end of the shaft A are eccentrics A A driving straps A A and eccentric rods A A. These eccentrics are spaced 180 degrees one from the other.

Erected upon the base frame A is an upwardly extending shaker frame B, made up of horizontal and vertical beams bolted or otherwise fastened together. B is a coarse screen mounted for reciprocation on the links B downwardly depending from the further frame B. These links are mounted on the shafts 13 in bearing blocks B and are outside of the frame B and support by means of bearings as shown the screen shafts B which extend outwardly beyond the frame and support the coarse screen B by means of saddle clips B. The connecting rods A are pivoted on one of said shafts B so that as the eccentric driving shaft rotates and carries the eccentric with it the upper coarse screen will be reciprocated.

It will be noted that the upper coarse screen is located between the cross pieces of the upper frame but that the hangers or links upon which it is swung are located on the outside, thus the whole assembly takes up a minimum of room and all the moving parts-are easily gotten at for adjustment, change and repair.

C is a lower screen frame mounted within the supporting housing or framework and supported on the upwardly extending links C C which are pivoted on shafts C C extending through the pillow blocks C C on the frame work A. The eccentric rods A A engage one of the shafts C so that as the eccentric shaft rotates the screen will be reciprocated. It will be noted that since the two eccentrics are separated by an angle of 180 degrees the two screens will reciprocate in opposite directions and there will thus be a very large degree of balance between them. C is a chute which discharges material from any suitable source onto the screen B adjacent one end. As the screen reciprocates the material passes down toward the left, the fine particles falling through, the coarse particles going on until they are discharged over the end of the screen onto a chute C. The particles which fall through the screen B are caught on the screen C somewhere along its length and pass on with those that are too coarse to pass through until they are discharged into the chute G The lines which go through are caught in the hogper C. You Wlll notice that this hopper 8 extends through the entire length of the screen C so that the material no matter where discharged is caught in the hopper. It will also be noted that the screen B is above the screen 0 for substantially its entire length so that anything that is discharged through the screen 131 will be caught by the screen C and-thus all ma rotation on the shaft (1*:

ing direction and in order to assist in the smooth, runnin balance of the device, I have tied up t e two reciprocating screens by spring tie members WhlCh tend to exert at all times a yieldingv pull onthe screens normally turning them to their central po-- sition and resisting their movement away from the central position in both directions. These springs are so arranged that the farther the screen moves in the opposite direction, because they always move toward or from one another and never in the same 'di rection, the harder be the pull of the spring and to assist in reducing vibration and balancing the screen.

I have shown these balancing springs in several forms, the first form, consists in two open springs arranged in a pair and while probably cheaper I am inclined to prefer the other form l ecause of its greater durability and accuracy. I have described first, however, the form shown in Figs. 2 and 3. i I f D D are yokes pivoted on the shaft B C. These yokes extend across ;and terminate in arms through which pass loops D D there being one loop on either side ofeach shaft B C. Coil tension springs D are attached to the loops D D l being so positioned that when the two screens are in the central position there isistillk a considerable tension upon these springs. The springs being of the same strength balance each other and hold the yoke substantially parallel. I) is a pipe or rod extending downwardly from one of the yokes D in slid-able engagement with a pipe or rod D extending upwardly from the other yoke D. A grease cup D on the rods D co unicates with the interior thereof and w'th the exterior of the rod D whereby grea may be moved under pressure to lubricate lzlloth of the yokes D=where they ride upon the shaft D C. There will be a sliding movement of these two tubes or rods one upon the other as the screens move back. and forth, and these two rods tend to assistthe spring yoke couples in holding the parts together and to prevent looseness and play.

Referring now to the form shown in Figs. 4: and 5, E is a yoke mounted on the eililft B Downwardly extending from his yoke is a cylindrical lug E in which is rretvthreaded the piston rod E carrying at its end a piston E havingan enlarged. annular head E. E is a yoke mounted for It is provided with an upwardly extending screw-threaded collar E in which is screw-threaded a cylindrical housing E terminating at its upper end in a screw-threaded apertured cap E The aperture in this cap is in slidable ,in the supporting frame.

engagement with'the lug E. E is a compression spring contained within the housmg E" and adapted to be compressed between the cap 8 and the flange E, the flange E being also in slidable engagement with the housingE". This housing provides a grease container in which the spring reciprocates. The grease, of course, keeps the spring in proper condition as well as the bearing surfaces between the flange E and the housing E and between the walls of the aperture of the cap E and the lug E In Fig. 6 I have shown a modified form in which the driving shaft is located with- In this form I have shown the further modification of the spring suspension in that the springs D there shown are simply coil springs pinned to the screens. i

It ispossible to substitute in either form of my invention, a crank shaft and connecting rods in place of the eccentric.

It will be evident that while I have shown in my drawings an operative device, still many changes might be made in size, shape and arrangement of parts without departing materially from the spirit of my invention and I wish, therefore, that my grammatic.

The use and operation of my invention are as follows When power is applied to the main drive shaft and it rotates, the two eccentrics will rotate with it. Since they are separated by an angle of 180 degrees and since they are connected by links one to each of the reciprocating screens, it will be evident that these screens will work back and forth their movement beingseparated by an angle of 180 degrees that is, they will be moving in opposite directions at all times, and when the upper one is at the right hand limit of its excursion the lower one will be at the left hand limit of its excursion and vice versa. Since the links upon which these screens are mounted are of the same length and since the relation between the screens and the links is such that the drive of the eccentric tends to throw the screens up owing to its eccentricity and allow them to drop down projecting the material forward there will be a constant travel of the material along each screen from the right hand toward the left hand end but since these screens are comparatively heavy the strain on the driving mechanism caused by changing their direction and their speed of movement will be considerable and I have provided, therefore, yielding means which tend to return each screen to the neutral or central position. This yielding means takes the form of a spring or elastic member which tends to pull the two links of each pair into parallelism or into the position which they would occupy drawings be regarded as in a sense diawhen the screens are in their central or neutral positions, and of course, since the screens move in opposite directions, the tension on the spring will be. greatly increased toward the end of the stroke and thus the springstored energy in the spring will be sufiicient largely to cause the return movement and thus to greatly assist the power mechanism in overcoming inertia. of the screens.

The preferred form indicated in Figs. 4 and 5 provides an inclosed properly lubricated spring. The housing being a telescoping housing permits free movement of the parts and compression and expansion of the spring at all times and the association of the two screens moving in opposite directions with their respective springs is such that the Whole device may be a self-contained, selfbalanced, screen structure I claim 1. A screening machine comprising two reciprocating screens one above the other, means for reciprocating them in unison in opposite directions and yielding means interposed between the two screens and lying wholly within said machine for resisting their movement away from the central position said yielding means comprising coil springs attached adjacent the opposite ends of the screens.

2. A screening machine comprising two reciprocating screens arranged one above the other, rocker arms upon which the screens are mounted, the arms for the upper screen downwardly depending below their pivot points, for the lower screen upwardly extending above their pivot points and means applied to the ends of said rocker arms for reciprocating the screens in opposite direc-' tions, yielding means interposed between the screen ends of the rocker arms on the two screens for resisting movement of the screens away from their central position.

3. A screening machine comprising two reciprocating screens arranged one above the other, rocker arms upon which the screens are mounted, the arms for the upper screen downwardly depending below their pivot points, for the lower screen upwardly extending above their pivot and yielding means applied to the screens comprising a spring arrangement adapted to resist separation of the screen ends of the supporting rocker arms of the two screens.

4. A screening machine comprising two reciprocating screens one above the other, means for reciprocating them in unison in opposite directions, shafts attached to each of said screens, sleeves mounted on said shafts, a cylindrical lug projecting from one, a cylindrical housing from the other, a sliding connection between the lug and the housing, a plunger projecting outwardly from the lug and engaging the housing adjacent its supporting sleeve and a spring interposed between the outer end of the housing and the plunger to resist separation of lug and housin 5. A screening machine comprising two reciprocating screen plates, links upon which .they are supported, an eccentric driving shaft for the screens and eccentric rods ex tending therefrom to the screens, the links supporting the upper screen extending downwardly toward it thus supporting it, the lower links extending upwardly toward the screen and supporting the lower screen, the eccentrics on the shaft which drive the eccentric rods being separated by an angle of 180, yielding means tying together the screen ends of the links of the two screens and adapted to resist movement of the screens away from their central position.

6. The combination with two reciprocating screens superimposed one above the other of means for moving them in opposite directions in unison and yielding means interposed between the screens adapted to progressively and increasingly resist the movement of the two screens away from their central positions.

7. A screening machine comprising two parallel reciprocating screens superimposed one above the other, means for moving them in opposite directions in unison, said means lying substantially within the screening machine and yielding means interposed between the screens adapted progressively and increasingly to resist the movement of the two screens away from their central positions.

8. A screening machine comprising two reciprocating screen plates, a frame in which they are supported by links, an eccentric driving shaft for said screens located within said frame and eccentric rods extending from the shaft to the screens, the links supporting the upper screen, extending downwardly toward it thus supporting it, the lower links extending upwardly and supporting the lower screen, the eccentrics on the shaft which drive the eccentric rods being separated by an angle of 180, yielding means tying together the screen ends of the links of the two screens, and adapted to resist movement of the screens away from their central position.

9. A screening machine comprising a supporting frame, two horizontal screens, one above the other mounted in it by rocker arms and a yielding connection between the said screens, means oscillating them in unison in opposite direction, situated within the frame and comprising an eccentric shaft and eccentric rods connected to the screens.

10. A screening machine comprising a supporting f'ame, two horizontal screens, one above the other, supported in it by rocker arms, means lying within the frame for oscillating them in unison in opposite direction and yielding tension exerting action between them, adapted to resist said oscillatory motion.

11. A screening machine, comprising a 1 frame, two screens Within said frame, one

5 superimposed above the other, the lower screen supported from below, and the upper screen supported from above, means located Within said frame for oscillating said screens in unison in opposite directions, and yield- 10 ing means lying substantially Within said frame, connecting said screens, and adapted progressively, and increasingly to resist said oscillatory motion. In testimony whereof I affix my signature in the presence of two witnesses this first 15 day of February, 1919.

MATT OTTO.

Witnesses: I

R. G. SPENCER, FRANK J. KELLY.

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